From the Yosemite Road Construction webpage:
Sentinel Drive (between Yosemite Village and Southside Drive) will be closed due to contruction from approximately June 5 through July 6, 2023. Work will begin in late May in the area. Improvements are being made to Sentinel Drive as part of a larger project in Yosemite Valley to create a more continuous flow traffic pattern This is one of the primary modifications being made as part of the Yosemite Valley circulation system. The schedule is subject to change according to weather conditions and availability of materials. Please drive or cycle carefully and watch for workers and equipment in the roadway.
Work along Sentinel Drive will include:
saw-cutting pavement
removal of asphalt and concrete
fabrication of concrete forms
modifications to the Sentinel Bridge parking area
construction of a center median
new curb work